Engineering & Analysis Methods > Panel Buckling

Orthotropic Flat Plate SSSS Shear Buckling

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Ömer:
We calculated shear buckling critical load, Nxy_cr, both in HyperSizer and according to Method Documentation of HyperSizer (Plate and Shell Equations.HME in Buckling of Failure Analysis). We made this comparison for a few component and we saw that these two result which belong to HyperSizer and Method Document are very different in some cases, although they are similar sometimes.

For the parameters below:

D is the stiffness matrix,
D11: 1050575
D12: 184745
D22: 428207
D33: 211547.5

Buckling Spans,
a: 538.3 mm
b: 1405.5 mm

Shear Load,
Nxy: -40 N/mm

Method Result: 108.76 N/mm
Result is showed by HyperSizer: 158.6 N/mm

What is the reason of this difference? Which one is more reliable? And, if HyperSizer result is more acceptable, how can we calculate the same value analytically?

Thank you

Stephen:
Hi,

It turns out that the HME document you are referring to actually has a couple of typos that are resulting in the difference you are seeing there. The actual reference equations are correctly reproduced in Word stress reports from the software, and attached below for reference. I've noted this so we can address it in a future revision of the HME.

An additional consideration if you are attempting to replicate the HyperSizer result is that we always use compressive stiffnesses when doing buckling calculations, even for shear.

Thanks,
Stephen

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